A patient presents with abnormal tuning fork results indicating bone conduction is greater than air on the left side. What condition is most likely causing this?

• A. Otosclerosis of the left ear
• B. Inner ear damage
• C. Acoustic neuroma
• D. Sensorineural hearing loss

Answer: (A)

When tuning fork tests reveal that bone conduction is greater than air conduction in one ear, it indicates a conductive hearing loss in that ear. In this specific scenario, the results indicate that the left ear is experiencing this condition.

Otosclerosis is a condition where abnormal bone growth in the middle ear leads to a fixation of the stapes bone, which in turn results in a reduction of sound transmission from the middle ear to the inner ear. This scenario is characteristic of conductive hearing loss, as the physical block to the transmission of sound waves creates a situation where bone conduction (directly stimulating the inner ear) is more effective than air conduction (which must travel through the affected structures).

Other conditions, such as inner ear damage or acoustic neuroma, typically cause sensorineural hearing loss, where air conduction is diminished more than bone conduction, or both are affected, but never in a scenario where bone conduction is greater than air. Therefore, the findings presented align most closely with otosclerosis as the cause of conductive hearing loss in the left ear.